Jar ring



1948- c. L. SILVIA ET AL 2,446,493

JAR RING Filed Dec. 7, 1945 Y 2 Sheets-Sheet 2 INVENTORS 1% 2 VW By Patented Aug. 3, 1948 UNITED FFICE JAR RING Application December 7, 1945, Serial No. 633,276

4 Claims. 1

This invention relates to a new and improved sealing ring for use in sea-ling preserving jars a d to a novel method of producing the ring. Such jars are commonly unsealed by forcing a knife under the cover and into the sealing ring to permit air to enter the jar and break the vacuum or by breakin the vacuum by pulling outwardly on a projecting lip provided on the ring. The former method may result in injury or a chipping of the jar and the latter method requires considerable eifort and difficulty in grasping the lip and exerting sufiicient force to unseal the jar. We have invented a novel ring with a bifurcated lip that may be readily grasped and the unsealing operation easily effected by tear-' ing the lip apart along a line of cleavage between two bifurcated portions thereof. The production of an improved sealin ring of this nature comprises the primary object of the invention.

Our invention contemplates the extruding of rubber through a die of a configuration to form a tube with an outwardly projecting lip, the severing of the lip longitudinally into two portions as it passes through the die, the subsequent resealing of the two portions together and the slicing of jar rings from the resulting tube. The jar rin thus formed comprises a fiat rubber annulus having an, outwardly protruding lip integral therewith and weakened along a severing line which extends through the lip and inwardly of the ring. Rubber which has been thus cut and resealed is weaker along the line of cut and jars employing our improved ring can be easily and conveniently unsealed merely by grasping the two bifurcated portions and. tearin them apart along the weakened line. The production of an improved ring having these characteristics comprises a further object of the invention.

These and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment thereof selected for purposes of illustration and shown in the accompanying drawings in which,

Fig. 1 illustrates in side elevation, partially in section, the extruding of a jar ring forming tube in accordance with our invention,

Fig. 2 is a rear end elevation of the tubing die,

Fig. 3 is a side elevation of the tubing die, partially in section, and

Fig. 4 is a fragmentary elevation of a jar ring out from the formed tube.

In the drawings, in indicates a tubing die having one end flanged at H and clamped in a tubing machine head I6 by a sleeve nut H. A spindle l8, also supported at its forward end by the tubing head, is disposed centrally of and extends into the die to provide an annular tubing passage between the die and spindle. Disposed longitudinally of and adjacent to and extendin horizontally along the periphery of the passage l9 through the die is a trough l2 open from end to end through the die. A severing knife M is mounted in the die outwardly of and extending radially through the trough and inwardly of the passage [9.

Rubber 20 is forced through the die ll] about the spindle l8 and is extruded therethrough in the form of a tube 2!. The rubber also passes into and through the trough l2 and forms an outwardly projecting rib 22 on and alon the extruded tube. The rubber passing through the trough and ast the knife [4 is bifurcated into two portions which thereafter reseal together along the severing line 25. A bridge I5 is also preferably provided between the trough I2 and the passage l5} for somewhat checkin and retarding the flow of the rubber which would otherwise be forced too rapidly through the enlarged cross section of the combined passage and trough.

' As the tube leaves the die a V-shaped lug [3 depending into the trough serves to form a V- shaped division 23 in and along the periphery of the rib 22 in alignment with the severing line 25.

Jar rings 2d of the desired thickness are formed by severing the same from the tube 2! in the conventional manner of forming jar rings. In the bifurcated lip at 22 are embodied two portions disposed at opposite sides of the line 25 and extending outwardly beyond the circumference of the body portion of the ring. These portions of the tube are resealed together along the line 25 rearwardly or beyond the knife I4 but their junction along this line is so substantially weakened that the portions may be separate along that line when pulled apart.

As illustrated in Fig. 4 the jar ring 24 is provided with an outwardly projecting lip 22 bifurcated into two portions along a resealed and weakened line 25 extending radially inward from the apex of a V-shaped outer recess 23 to a point somewhat short of the inner wall of the ring. The ring is used and functions in the usual manner to perform the jar sealin operation. When it is desired to unseal the jar the two portions of the lip 22 at opposite sides of the line 25 are grasped and pulled apart. The lip is weakest along the line 25 and therefore separates therealong and permits air to enter the jar and break the vacuum. The jar-cover can then be easily removed. Our invention therefore eliminates the unsealing difiiculties heretofore present and hereinabove described and provides a new and improved jar ring that can be easily and conveniently parted to effect the unsealing operation.

Having now disclosed our invention what we claim as new and desire to secure by Letters Patent is:

1. A jar ring'complrising a flat rubber annulus having an outwardly protruding lip integral therewith and weakened along a line extendingthrough the lip and inwardly of the ring from-apoint on the outer periphery of the lip, the rubber comprising the ring being bonded into; ai-uhitthroughout said annulus an'd acrosssaid weak ened line.

2. A jar ring comprising a flat rubber annulus having an outwardly protruding lip integral therewith and weakened along a line extending through the lip and inwardly of the ring from a.

point on the outer periphery of the lip to a, point adjacent to-butshortofthe inner circumference of the ring; therubber comprising the ring being bonded into a unit throughout said annulus and across said weakened line.

3. A jarring comprising' a fiat rubber annulus having an outwardly projecting lip integral posite sides of a line extending therethrough and inwardly of the ring from a point on the outer periphery of the lip, said portions having indepe'ndenfifa'ces adhered together in contact in a common plane along said line.

CYRIL L. SILVIA. AUSTIN SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Coldren Sept. 15, I903 Duritza Aug. 31, 1937 Smith H J an. 3,-1'939 Number 

